Question

When any of the following changes are observed during the reaction or after the
reaction
1. Change in the nature of the substances.
2. Change in the color of a substance.
3. Formation of precipitate.
4. Evolution of gas ​

Answer 1

Explanation:

these all are the changes in the state of various particles of a substance when some experiments are done on it.

change in the nature of the substance - during the reaction

change in the colour of a substance - after the reaction

formation of precipitate - during the reaction

evolution of gas - after the reaction

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Answer 2

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change the nature of the substance - during the reaction

change in colour of a substance - after the reaction

formation of precipitate - during the reaction

evolution of gas -after the reaction

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